Internal Friction Peaks of Cold-Worked Dilute Copper-Aluminium Alloys(Metallurgy)
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概要
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The internal friction of cold-worked Cu-Al alloys is measured with an inverted torsion pendulum in the temperature range between -180℃ and +100℃. Among 10 specimens with different contents of aluminium ranging from 0.01 to 2 at.%, distinct peaks are observed for the two compositions, 0.13 and 0.18 at.%Al, the peak height being larger for the former ; detailed studies are made on 0.13 at.%Al specimens. The peak is introduced by plastic deformation and disappears on annealing at temperatures around +150℃. For a specimen annealed in an oxidizing atmosphere prior to the final deformation, the peak is no longer observed. The peak is considered to be a combined effect of dislocations and aluminium atom-vacancy complexes.
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